
From Dictionary.com, justice is 1) the quality of being just; righteousness, equitableness, or moral rightness: to uphold the justice of a cause, 2) rightfulness or lawfulness, as of a claim or title; justness of ground or reason: to complain with justice, 3) the moral principle determining just conduct, 4) conformity to this principle, as manifested in conduct; just conduct, dealing, or treatment, 5) the administering of deserved punishment or reward, 6) the maintenance or administration of what is just by law, as by judicial or other proceedings: a court of justice and 7) judgment of persons or causes by judicial process: to administer justice in a community.
Once again, I have omitted some definitions such as those that refer to the Justice Department or an alternate name for a judge. Feel free to check out www.dictionary.com for yourself.
As you can see, justice is inextricably bound to righteousness and morality. Without righteousness and morality, or the ability to judge between what one thinks is right and wrong, justice cannot exist. In addition, justice is of no effect without comparison. One man cannot be unjust to himself.
Thus, justice is the moral determination through righteous decision regarding whether or not ideas and actions are fair, or equitable, between one person or act and another. Further, once a comparison has been deemed unjust, or unfair, justice is also the action by which equality is achieved.
Combining this with the definition of "social" established yesterday, "social justice" is a determination, based on righteousness and morality, made by a community or group of people, upon comparison to another community or group, that an inequality exists. Social justice also necessarily includes those actions taken by a group to restore equilibrium.